docs: def get_unit_property(self, unit_id, property_name):
          '''This function rerturns the data stored under the property name given
          from the given unit.
  
          Parameters
          ----------
          unit_id: int
              The unit id for which the property will be returned
          property_name: str
              The name of the property
          Returns
          ----------
          value
              The data associated with the given property name. Could be many
              formats as specified by the user.
          '''
          if isinstance(unit_id, (int, np.integer)):
              if unit_id in self.get_unit_ids():
                  if unit_id not in self._unit_properties:
                      self._unit_properties[unit_id] = {}
                  if isinstance(property_name, str):
                      if property_name in list(self._unit_properties[unit_id].keys()):
                          return self._unit_properties[unit_id][property_name]
                      else:
                          raise ValueError(str(property_name) + " has not been added to unit " + str(unit_id))
                  else:
                      raise ValueError(str(property_name) + " must be a string")
              else:
                  raise ValueError(str(unit_id) + " is not a valid unit_id")
          else:
              raise ValueError(str(unit_id) + " must be an int")